The S8's listening-window response (a five-point average of axial and +/–15-degree horizontal and vertical responses) measures +1.92/–1.44 dB from 200 Hz to 10 kHz. The –3dB point is at 42 Hz, and the –6dB point is at 35 Hz. Impedance reaches a minimum of 3.57 ohms at 98 Hz and a phase angle of –33.86 degrees at 57 Hz.

The C5's listening-window response measures +1.76/–3.02 dB from 200 Hz to 10 kHz. An average of axial and +/–15-degree horizontal responses measures +1.88/–2.73 dB from 200 Hz to 10 kHz. The –3dB point is at 54 Hz, and the –6dB point is at 46 Hz. Impedance reaches a minimum of 4.94 ohms at 63 Hz and a phase angle of –61.64 degrees at 49 Hz.

The ADP's three-face averaged response measures +2.05/–1.86 dB from 200 Hz to 10 kHz. The –3dB point is at 88 Hz, and the –6dB point is at 79 Hz. Impedance reaches a minimum of 3.74 ohms at 198 Hz and a phase angle of –28.46 degrees at 96 Hz.

The Servo's close-miked response, normalized to the level at 80 Hz, indicates that the lower –3dB point is at 19 Hz and the –6dB point is at 17 Hz. The upper –3dB point is at 148 Hz with the cut-off frequency control set to maximum.—MJP